Aluminum alloy and in articles made therefrom.



unrrnn shares ALUMINUM ALLOY AND IN'ARTIGLES MADE THEREFROM.

No Drawing.

To all whom it may concern:

Be it known that I, ALBERT IV. MORRIS, a citizen of the United States,residing in Springfield, Massachusetts, have invented certainImprovements in Aluminum Alloys and in Articles Made Therefrom, of whichthe following is a specification.

My invention relates to an aluminum alloy and to castings or forgingsmade therefrom, the object of my invention being to provide an alloywhich Will permit of the full chilling effect of the mold or die, Willreduce the shrinkage of the castings or forgings, overcome the danger ofcracking of the same, and increase their density, tensile strength andelongation properties as compared With those produced from the alluminumalloys at present in use.

This object I attain by adding iron to the alloy as hereinafter setforth. The alloy may consist of aluminum and iron alone, or it maycontain other metals such as zinc, copper, nickel, cadmium, magnesium,manganese, or one or more of these metals, besides the aluminum andiron.

It is generally believed by those experienced in the art of casting orforging articles of aluminum alloy that the presence of iron isdetrimental and tends to make the castings or forgings brittle,particularly When hot, but I have discovered that the presence ofcertain percentages of properly. alloyed iron materially improves suchcastings or forgings in the respects noted in the first paragraphhereof.

Where the alloy contains also anothermetal or other inetals, thepercentage of aluminum should not be less than 70% of the Whole, and thepercentage of iron should not be less than 1% or more than 6%. Careshould betaken to keep the silicon content as low as possible.

A casting or forging made from my im- Specification of Letters Patent.

Patented May 22, 1917.

Application filed November 26, 1915. Serial No. 63,475.

- proved alloy may be permitted to remain in contact with the mold ordies until it receives the full chilling effect of the same Without riskof causing it to crack, and I further find that the presence of ironreduces the shrinkage of the casting or forging, While at the same timeit increases its density, imparts to it a much higher tensile strengththan usual, and permits of greater elongation.

The iron may be introduced in the form of ferro-aluminum, ferro-zinc,ferro-copper, or the like, or-may be introduced in a metallic state inthe form, of chips, filings, etc., or it may be derived from thefurnace, pot, or crucible in Which the aluminum is melted or in Which itis retained in the molten state before being cast or forged.

'of gases Which would cause premature explosion of the shell.

I claim:

An alloy containing aluminum, iron, and one or more other hardeningmetals,such as nickel, the proportion of aluminum being not less than70% and the proportion of iron from 1% to 6% of the Whole.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribing witnesses.

ALBERT W. MORRIS Witnesses:

L. J. HARLEY, Jr., E. M. HOLLISTER.

